The syntactic structure illustrated by the following items is

• A. Subordination
• B. Appositive
• C. Modification
• D. Coordination

Answer: (D)

The key idea here is parallel structure: two or more elements share the same grammatical level and are joined to form one unit. That is what coordination does. In coordination, equal elements—whether words, phrases, or clauses—are linked by a coordinating device (like and, or, but) so they each could stand alone, but they work together in one phrase or sentence. This creates a balanced, symmetrical construction, rather than a hierarchy where one part depends on another.

This differs from subordination, which pairs a dependent element with a main element, showing which part is more central. It also differs from apposition, where a noun or noun phrase renames another noun but doesn’t add a second, equal unit. And it isn’t about modification, which adds descriptive detail to modify a word, rather than forming a second parallel unit. So the structure illustrated is coordination because it links equal pieces into a single, coordinated whole.